Sorry, Android will never happen. I absolutely hate cross platform development. You always need to compromise on so much platform specific goodies you could use without it. I am not willing to make these compromises. And there is a reason why everything audio related mainly happens on iOS. Audio support on Android is a mess.
You can install ST2 on a new iPad. You can find it under your purchases in the AppStore.
Regarding your payment issues, please get in touch with the AppStore support. They are able to help.